【单选题】光圈影响景深,光圈越大景深越______。
【单选题】下列哪种表述是正确的 ?
A.
与短期债券相比 , 长期债券的当期收 益率可以很好地近似到期收益率
B.
息票债券和贴现发行债券中 , 价格和 利率的变化方向是相反的
C.
距离到期日越远 , 利率同等幅度的变 动所引起的债券价格变动就越大
【单选题】听力原文: Leonardo da Vinci was born in 1452 in Tuscany. As early as 1466, he was working in a workshop. Then in 1482 he moved to Milan. After the plague has swept the city of Milan in 1484~ 1485, he turn...
【单选题】What has happened to the children of working mothers?
A.
They are in government-supported day care centers.
B.
They are in private day care centers.
C.
Their grandmothers take care of them.
D.
They are sent to boarding school.
【单选题】Cold ______ the night air was, he slept soundly because he was so tired after working for a whole day.